Too long ago for me to remember what the song was about, Joe; I've slept since then! I just recall the refrain. "I gave my heart to an Oyster Girl; my beautiful Oyster Girl"
I've had a pm suggesting Bob Cann, so might get on to Mark Bazeley, see if he recalls it. I must admit it's the sort of thing I've heard Bob doing when calling dances, singing a few words here and there to a tune in addition to the call.